TDA8844 datasheet(23/68 Pages) PHILIPS

23 / 68 page

December 16, 1997

Philips Semiconductors

Tentative Device Speciﬁcation

I2C-bus controlled PAL/NTSC/SECAM TV

processors

TDA884X/5X-N2 series

Table 50 Bypass of chroma base-band delay line

Table 51 Automatic colour limiting

Table 52 Enable external comb ﬁlter

Table 53 Start-up mode of black current loop; note 1

Note

1. When the circuit is in the automatic mode the RGB

drive is switched-on as soon as the black current loop

has stabilised. Under control of the

µ-processor the

condition of the black current loop is indicated via the

BCF bit. When this bit changes to 0 the RGB drive can

be switched-on by setting the AST bit to 0.

BPS

DELAY LINE MODE

active

bypassed

ACL

COLOUR LIMITING

not active

active

CMB

COMB FILTER

disabled

enabled

AST

MODE

automatic mode;

switch-on under control of

µ-processor

Table 54 Cathode drive level

Note

1. The given values are valid for the following conditions:

- Nominal CVBS input signal

- Settings for contrast, WPA and peaking nominal

- Black- and blue-stretch switched-off

- Gain of output stage such that no clipping occurs

- Beam current limiting not active

The tolerance on these values is about

± 3 V.

Table 55 Y-delay adjustment; note 1

Note

1. For an equal delay of the luminance and chrominance

signal the delay must be set at a value of 160 ns. This

is only valid for a CVBS signal without group

delay distortions.

Table 56 Dynamic skin control on/off

Table 57 Dynamic skin control angle

CL2

CL1

CL0

SETTING CATHODE DRIVE

AMPLITUDE; NOTE 1

000

57VBL-WH

63 VBL-WH

70 VBL-WH

77 VBL-WH

84 VBL-WH

91 VBL-WH

99 VBL-WH

107 VBL-WH

YD0 to YD3

Y-DELAY

YD3

∗ 160 ns +

YD2

∗ 80 ns +

YD1

∗ 40 ns +

YD0

∗ 40 ns

MODE

0off

1on

DSA

ANGLE OF CORRECTION

correction angle 123 degrees

correction angle 117 degrees

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